Telephone



(No Model. w

J. P. MOLAUGHLINL TELEPHONE. No. 343.334. Patented June 8, 1886.

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. WW i W I I E ATTORNEY N. PETERS. Pmwnm n mr. Wnshinglnu. 0. c

UNITED STATES PATENT OFFICE.

JAMES F. MCLAUGHLIN, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONE.

@PIECII'ICATION forming part of Letters Patent No. 343,334 dated June 8,1886.

Application filed July 21. 1884. Renewed April 15, 1886. Serial No.1519;020. (No model.)

To all whom it may concern.-

Be it known that I, J AMES F. MOLAUGHLIN, a citizen of the UnitedStates, residing at Philadelphia, in the county of Philadelphia andState of- Pennsylvania, have invented certain new and usefulImprovements in Telephones, of which the following is a specification,reference being had therein to the accompanying drawing, wherein isshown a longitudinal vertical section illustrating the construction of atelephone embodying my improvements.

My invention has relation to that form of telephones in which the coreof the diaphragm-helix is composed of two adjacent but separatedsoft-iron bars or pole-pieces secured to opposing ends of separatepermanent magnets; and it has for its object to simplify theconstruction of the instrument and increase its efficiency.

My invention accordingly consists of the combination, construction, andarrangement of parts comprising a telephone, as hereinafter describedand claimed. 7

In the drawing, A represents the box or casing, of the usual or othersuitable construction, having a removable month-piece, a, and adiaphragm, B, which is preferably made of wood and provided with asuitable plate or armature, Z), on its rear side. The case A is securedto the ends a c of two horseshoeshaped permanent magnets, O O, by meansof screws (6, and has a central aperture, a, in its rear wall, a, forthe passage of two soft-iron bars, D D, placed parallel to one another,but separated so as not to contact, as shown. These bars D D arerespectively secured to the opposing ends 0 e of magnets C O,fland forma divided or split core, (1, for the helix E, which is in circuit withthe line-wire. The members of the split core at are preferably connectedto the opposite poles of the magnets by screws d, or otherwise, asdesired. The magnets C C, it will be noted, are external to box A, andare so placed that their pole-pieces oppose each other to form anelliptical shaped arrangement of magnets, as shown, which, if desired,may be utilized as a handle for the telephone. Said ends 0* c aresurrounded with helices I I, electrically connected at i, in which casethe sleeve G ischambered out at each end, as shown at g, to receive thehelices I, to not only protect them, but also to serve as a hand-piecefor the telephone and for maintaining the magnet ends 0* 0" in'due andfixed alignment. The helices I I are in circuit with helix E and itsground and line circuits.

When the helices I are used, the impulses sent over the line to thetelephone first pass through helices I before entering helix E. Thecurrent-impulses, as they traverse the former, set up magneticdisturbances in the magnets O O, substantially in unison with thecorresponding impulses induced in the core d by the current-impulses inhelix E. The combined action of the simultaneous disturbances in magnetsO C and core (I, as above described, gives a resultant increased orintensified magnetic disturbance for or in the polepiece d, forvibrating the diaphragm and cause it to reproduce sounds clearly anddistinctly.

What I claim is- 1. A telephone comprising a case, a diaphragm, and ahelix common to two separate soft-iron bars,each of which is attached toa pole of separate permanent magnets arranged with their poles opposingbut separated from one another, the other poles of which are providedwith helices, and all said helices being in circuit with one another orin common line-circuit, substantially as shown and described.

2. In a telephone, the combination of horse' shoe permanent magnets (30,arranged with their poles facing but separated from one another,soft-iron bars D D, secured to a pair of poles of said magnets, andforming a split or divided core-piece for a helix, E, helices I,surrounding the remaining poles of said magnet, and circuit-connectionfor said helices, substantially as shown and described.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES F. MOLAUGHLIN.

Witnesses:

S. J. VAN STAVOREN, CHAS. F. VAN HORN.

